package com.spzx.order.service.impl;

import com.alibaba.nacos.client.naming.utils.CollectionUtils;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.spzx.cart.api.RemoteCartService;
import com.spzx.cart.api.domain.CartInfo;
import com.spzx.common.core.constant.SecurityConstants;
import com.spzx.common.core.context.SecurityContextHolder;
import com.spzx.common.core.domain.R;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.common.core.utils.StringUtils;
import com.spzx.common.rabbit.constant.MqConst;
import com.spzx.common.rabbit.service.RabbitService;
import com.spzx.order.api.domain.OrderInfo;
import com.spzx.order.api.domain.OrderItem;
import com.spzx.order.domain.OrderLog;
import com.spzx.order.domain.vo.OrderForm;
import com.spzx.order.domain.vo.TradeVo;
import com.spzx.order.mapper.OrderInfoMapper;
import com.spzx.order.mapper.OrderItemMapper;
import com.spzx.order.mapper.OrderLogMapper;
import com.spzx.order.service.IOrderInfoService;
import com.spzx.product.api.RemoteProductService;
import com.spzx.product.api.domain.vo.SkuLockVo;
import com.spzx.product.api.domain.vo.SkuPrice;
import com.spzx.user.api.RemoteUserAddressService;
import com.spzx.user.domain.UserAddress;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@Service
public class OrderInfoServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfo> implements IOrderInfoService {
    @Autowired
    private OrderInfoMapper orderInfoMapper;

    @Autowired
    private OrderItemMapper orderItemMapper;

    @Autowired
    private OrderLogMapper orderLogMapper;

    @Autowired
    private RemoteCartService remoteCartService;

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RemoteProductService remoteProductService;

    @Autowired
    private RemoteUserAddressService remoteUserAddressService;

    @Autowired
    RabbitService rabbitService; //来自于公共模块：spzx-common-rabbit

    /**
     * 查询订单列表
     *
     * @param orderInfo 订单
     * @return 订单
     */
    @Override
    public List<OrderInfo> selectOrderInfoList(OrderInfo orderInfo) {
        return orderInfoMapper.selectOrderInfoList(orderInfo);
    }

    /**
     * 查询订单
     *
     * @param id 订单主键
     * @return 订单
     */
    @Override
    public OrderInfo selectOrderInfoById(Long id) {
        OrderInfo orderInfo = orderInfoMapper.selectById(id);
        List<OrderItem> orderItemList = orderItemMapper.selectList(new LambdaQueryWrapper<OrderItem>().eq(OrderItem::getOrderId, id));
        orderInfo.setOrderItemList(orderItemList);
        return orderInfo;
    }


    @Override
    public TradeVo orderTradeData() {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();

        R<List<CartInfo>> cartInfoListResult = remoteCartService.getCartCheckedList(userId, SecurityConstants.INNER);
        if (R.FAIL == cartInfoListResult.getCode()) {
            throw new ServiceException(cartInfoListResult.getMsg());
        }
        List<CartInfo> cartInfoList = cartInfoListResult.getData();
        if (CollectionUtils.isEmpty(cartInfoList)) {
            throw new ServiceException("购物车无选中商品");
        }

        //将集合泛型从购物车改为订单明细
        List<OrderItem> orderItemList = null;
        BigDecimal totalAmount = new BigDecimal(0);
        if (!CollectionUtils.isEmpty(cartInfoList)) {
            orderItemList = cartInfoList.stream().map(cartInfo -> {
                OrderItem orderItem = new OrderItem();
                BeanUtils.copyProperties(cartInfo, orderItem);
                orderItem.setSkuPrice(cartInfo.getSkuPrice());
                return orderItem;
            }).collect(Collectors.toList());

            //订单总金额
            for(OrderItem orderItem : orderItemList) {
                totalAmount = totalAmount.add(orderItem.getSkuPrice().multiply(new BigDecimal(orderItem.getSkuNum())));
            }
        }

        //渲染订单确认页面-生成用户流水号
        String tradeNo = this.generateTradeNo(userId);

        TradeVo tradeVo = new TradeVo();
        tradeVo.setTotalAmount(totalAmount);
        tradeVo.setOrderItemList(orderItemList);
        tradeVo.setTradeNo(tradeNo);
        return tradeVo;
    }

    /**
     * 渲染订单确认页面-生成用户流水号
     * @param userId
     * @return
     */
    private String generateTradeNo(Long userId) {
        //1.构建流水号Key
        String userTradeKey = "user:tradeNo:" + userId;
        //2.构建流水号value
        String tradeNo = UUID.randomUUID().toString().replaceAll("-", "");
        //3.将流水号存入Redis 暂存5分钟
        redisTemplate.opsForValue().set(userTradeKey, tradeNo, 5, TimeUnit.MINUTES);
        return tradeNo;
    }


    @Transactional(rollbackFor = Exception.class)
    @Override
    public Long submitOrder(OrderForm orderForm) {
        Long userId = SecurityContextHolder.getUserId(); //从线程上获取

        //1.去重
        String userTradeKey = "user:tradeNo:" + userId;
        String scriptText = "if redis.call(\"get\",KEYS[1]) == ARGV[1]\n" +
                "then\n" +
                "    return redis.call(\"del\",KEYS[1])\n" +
                "else\n" +
                "    return 0\n" +
                "end";
        DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
        redisScript.setScriptText(scriptText);
        redisScript.setResultType(Long.class);
        Long flag = (Long) redisTemplate.execute(redisScript, Arrays.asList(userTradeKey), orderForm.getTradeNo());
        if (flag == 0) {
            throw new ServiceException("请勿重复提交订单，请尝试重试");
        }

        //2.验空
        List<OrderItem> orderItemList = orderForm.getOrderItemList();
        if(CollectionUtils.isEmpty(orderItemList)){
            throw new ServiceException("数据不能为空");
        }

        //3.校验价格是否一致，不一致更新价格,取消下单
        List<Long> skuIdList = orderItemList.stream().map(OrderItem::getSkuId).collect(Collectors.toList());

        R<List<SkuPrice>> skuPriceListResult = remoteProductService.getSkuPriceList(skuIdList, SecurityConstants.INNER);
        if (R.FAIL == skuPriceListResult.getCode()) {
            throw new ServiceException(skuPriceListResult.getMsg());
        }
        List<SkuPrice> skuPriceList = skuPriceListResult.getData();

        Map<Long, BigDecimal> skuIdToSalePriceMap = skuPriceList.stream().collect(Collectors.toMap(SkuPrice::getSkuId, SkuPrice::getSalePrice));

        String priceCheckResult = "";
        for (OrderItem orderItem : orderItemList) {
            if (orderItem.getSkuPrice().compareTo(skuIdToSalePriceMap.get(orderItem.getSkuId())) != 0) {
                priceCheckResult += orderItem.getSkuName() + "价格变化了; ";
            }
        }
        if(StringUtils.isNotEmpty(priceCheckResult)) {
            //更新购物车价格
            remoteCartService.updateCartPrice(userId, SecurityConstants.INNER);

            throw new ServiceException(priceCheckResult);
        }


        //4.检查与锁定库存
        List<SkuLockVo> skuLockVoList = orderItemList.stream().map(item -> {
            SkuLockVo skuLockVo = new SkuLockVo();
            skuLockVo.setSkuId(item.getSkuId());
            skuLockVo.setSkuNum(item.getSkuNum());
            return skuLockVo;
        }).collect(Collectors.toList());
        String checkAndLockResult = remoteProductService.checkAndLock(orderForm.getTradeNo(), skuLockVoList, SecurityConstants.INNER).getData();
        if(StringUtils.isNotEmpty(checkAndLockResult)) {
            throw new ServiceException(checkAndLockResult);
        }


        //5.保存订单(order_info\order_item\order_log)
        Long orderId = null;
        try {
            orderId = saveOrder(orderForm);
        } catch (Exception e) {

            // 下单异常，解锁库存。
            //4.1 下单失败，解锁库存
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderForm.getTradeNo());
            throw new ServiceException("下单失败");
        }

        //6.删除购物车商品。考虑一下：可以在支付后删除购物车勾选的商品。否则，下单取消，还得把商品加回购物车。
        remoteCartService.deleteCartCheckedList(userId,SecurityConstants.INNER);

        //7.发送延迟消息。指定支付等待时间，如果不支付，消费者处理延迟消息就会自动取消订单，解锁库存。
        rabbitService.sendDealyMessage(MqConst.EXCHANGE_CANCEL_ORDER,
                MqConst.ROUTING_CANCEL_ORDER,
                String.valueOf(orderId), MqConst.CANCEL_ORDER_DELAY_TIME);

        return orderId;
    }

    @Transactional(rollbackFor = Exception.class)
    public Long saveOrder(OrderForm orderForm) {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        String userName = SecurityContextHolder.getUserName();
        //1.保存订单数据
        OrderInfo orderInfo = new OrderInfo();
        orderInfo.setOrderNo(orderForm.getTradeNo());
        orderInfo.setUserId(userId);
        orderInfo.setNickName(userName);
        orderInfo.setRemark(orderForm.getRemark());
        UserAddress userAddress = remoteUserAddressService.getUserAddress(orderForm.getUserAddressId(), SecurityConstants.INNER).getData();
        orderInfo.setReceiverName(userAddress.getName());
        orderInfo.setReceiverPhone(userAddress.getPhone());
        orderInfo.setReceiverTagName(userAddress.getTagName());
        orderInfo.setReceiverProvince(userAddress.getProvinceCode());
        orderInfo.setReceiverCity(userAddress.getCityCode());
        orderInfo.setReceiverDistrict(userAddress.getDistrictCode());
        orderInfo.setReceiverAddress(userAddress.getFullAddress());

        List<OrderItem> orderItemList = orderForm.getOrderItemList();
        BigDecimal totalAmount = new BigDecimal(0);
        for (OrderItem orderItem : orderItemList) {
            totalAmount = totalAmount.add(orderItem.getSkuPrice().multiply(new BigDecimal(orderItem.getSkuNum())));
        }
        orderInfo.setTotalAmount(totalAmount); //实付总价格 (减掉优惠钱 + 运费的钱)
        orderInfo.setCouponAmount(new BigDecimal(0));
        orderInfo.setOriginalTotalAmount(totalAmount); //商品总价格(不包括优惠卷和运费)
        orderInfo.setFeightFee(orderForm.getFeightFee());
        //OrderInfo类的orderStatus属性的类型改为Integer
        orderInfo.setOrderStatus(0); //订单状态【0->待付款；1->待发货；2->已发货；3->待用户收货，已完成；-1->已取消】
        //orderInfo.setCreateTime(new Date());
        orderInfoMapper.insert(orderInfo); //主键回填

        Long orderId = orderInfo.getId();

        //2.保存订单项数据
        //List<OrderItem> orderItemList = orderForm.getOrderItemList();
        orderItemList.forEach(orderItem -> {
            orderItem.setOrderId(orderId);
            orderItemMapper.insert(orderItem); //性能优化 - 批量保存
        });

        //3.保存订单日志数据
        OrderLog orderLog = new OrderLog();
        orderLog.setOrderId(orderId);
        orderLog.setProcessStatus(0); //订单状态【0->待付款；1->待发货；2->已发货；3->待用户收货，已完成；-1->已取消】
        orderLog.setNote("提交订单");
        orderLog.setOperateUser("用户");
        orderLogMapper.insert(orderLog);
        return orderId;
    }

    @Transactional
    @Override
    public void processCloseOrder(long orderId) {
        OrderInfo orderInfo = orderInfoMapper.selectById(orderId);
        if(orderInfo != null && orderInfo.getOrderStatus().intValue() == 0){ //延迟消息到了，还没有付款，关单
            orderInfo.setOrderStatus(-1);
            orderInfo.setCancelTime(new Date());
            orderInfo.setCancelReason("超时未付款系统自动关单");
            orderInfoMapper.updateById(orderInfo);

            OrderLog orderLog = new OrderLog();
            orderLog.setOrderId(orderId);
            orderLog.setProcessStatus(-1); //订单状态【0->待付款；1->待发货；2->已发货；3->待用户收货，已完成；-1->已取消】
            orderLog.setNote("系统取消订单");
            orderLog.setOperateUser("系统");
            orderLogMapper.insert(orderLog);

            //发送MQ消息通知商品系统解锁库存
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderInfo.getOrderNo());
        }
    }

}